Means for producing reduplicative master sheets in typewriting and like machines



Oct. 26, 1948. c. w. BRUMHILL 2,452,099

MEANS FOR PRODUCING REDUPLICATIVE MASTER SHEETS IN TYPEWRITING AND LIKE MACHINES Filed Oct. .24, 1945 s Sheets-Sheet 1 t- 1943- v c. w. BRUMHILL MEANS FOR PRODUCING REDUPLICATIVE MASTER SHEETS IN TYPEWRITING AND LIKE MACHINES 3 Sheets-Sheet 2 Filed Oct. 24, 1945 lnventor 9; CJ m.

Oct. 26, 1948. Q w, BRUMHlLL 2,452,099

MEANS FOR PRODUCING REDUPLICATIVE MASTER SHEETS IN TYPEWRITING AND LIKE MACHINES FiledOot. 24, 1945 3 Sheets-Sheet 3 I mus/rialpatented Oct. 25, 1948 MEAN-S TEOR -,PRQDUCING. REDUPLIGATIVE MASTER SHEETS IN TYPEWRlTlNGe-AND I LIKE MACHINES a Claude Wellington Brumhilh. Leicestenhfingland, .zassignonito The imperialclaypewriterfiomnany I Limited; LeiccstemEngland Application .0ctober'24, 1945', SeiialNo. 624,160

In Great-Britain i! une"'1;1945

' 'EiClaims. i (01. 19'1-1-153) 'iThis invention concerns typewritingand like machines of the'kind (commonly known as hectograph machines) wherein the type impressions are produced in reverse on the back of a master sheet,--of-paper or thelike, by feeding a ribbon at the typing station between said sheet and-a support' surface suchas a platen. 'This master sheet is subsequently employed.for the production of a multiplicit of copies of the master sheet by a hectograph duplicating process.

In order to get clear and legible copies from the master sheet it is desirable that. the sheet be tYDBCl-Olllfi, platen with a reasonably hard surface but rnots sohard that the-master sheet and. the hectographribbon are liable to be perforateda-by theimpactof the type heads. It: so happens that although rrubber. faced. platens are; known which initially give satisfactory results; after air-time the surface hardens up and the results deteriorate. Moreover, at the present time, owing to the scarcity of rubber, platens having a facing of cork are in general use and owing to their granular surface these platens give poor results. An object of the present invention is to overcome these difficulties and to provide means whereby good impressions may be obtained substantially irrespective of the quality of the platen itself.

Therefore, the invention provides in a typewriting or like machine of the kind specified, a thin anvil at the typing station for location between the ribbon and support surface, to take the typing impacts. Such an anvil may readily be produced having the desired combination of hardness and a certain degree of resilience, and although if as preferred the anvil has a stationary location the typin impacts will appear in succession on the same area of it matters may readily be so arranged that the anvil is readily detachable from a support so that a used anvil may be replaced by a new one. This support advantageously extends forwards and downwards.

The anvil is preferably made of a slightly res silient non-metallic sheet material such for example as waxed paper, Celluloid and certain other synthetic resins.

The foregoing and other features of the invention set out in the appended claims are incorporated in the construction which will now be described with reference to the accompanying drawings, in which- Figure l is a plan of a typewriter of the kind specified;

Figure 2 is a front elevation of the platen, the ribbon guide heretofore mentioned and the anvil;

Z-Figurei: 3. 1s 3;: section on. a larger: scale taken 1 on the-lindlfiJ in'Figm; r i -Figure 4- is a' front elevation of the. anvil, and Fi ure" 5; an endelevation thereof. Theinvention is. shown aswapplied to a typewriter 1 having-rat body. I :with,-.ai keyboard: 2 inconporating az .tabulatingakeyfl, a carriage :(indicated generally at 4) incorporating a: plateniili with linespace leverB, feed rolls Q forfeeding the master sheet i 0 round the platen; means .for feeding a normal typewriter ribbon H in front of the-master: sheet to: at typing: station .TS soas to bexstruel-ri by the. type heads l 2 and means for feeding'aheetograph paperribborr l3.-.alongv the face of. .thamlatem at. ithet-back neither-master; sheet; .-I 0

with its,.-treat.ed :taee: forward.

L.'.- A stationary:. slipportcarmi 4-6.: curves:- forwards a d;:downwards:orenthe-carriage hand supports at the typing station a stationary ribbon guide M for engaging and positioning the ribbon [3 at the back of the sheet III. This guideforms the subject of co-pending U. S. patent application Serial No. 624,159 and it comprises legs I5 spaced apart one at each side of the typing station which have upper and lower lobes l5a and l5b respecttively for embracing the edges of the ribbon l3 and for positioning the latter against edgewise displacement. It will be seen that the arm I6 affords room beneath it at the rear of the platen to accommodate the sheet In which is to be fed under the platen, and that its front end has such a location that the sheet ill in ascending from the typing station passes up in front of it.

The anvil 25 is detachably mounted on this guide M to form a backing strip which is interposed between the ribbon l3 and the face of the platen 6 at the point between the guide legs l5 whereat the type impacts occur. It therefore relieves the surface of the platen of these impacts. Its shape is best disclosed in Figs." 4 and 5 from which it will be seen that it is curved to conform to the curvature of the platen and has a top bar 25a which serves for its attachment to the guide l4 and a central depending leg 25b which hangs between the guide legs I5 and the surface of which takes the typing impact. It is detachably mounted by means of dome headed studs 26 on guide 14 which enter openings 21 in the top bar 25a.

It will therefore be appreciated that this stationary removable backing strip 25 permits a good impression to be obtained on the master sheet l0 (resulting in clear duplicates of the master sheet) substantially irrespective of quality of surface of the platen,

1. In a' typewriti'rigi ni achine oi 'itheiiindgin which type impressions are produced in reverse on the back of a master sheet, by feeding a ribbon si;

between the sheet and the front of a rotary platen with an impression-producingface; ,bflthef ribbon presented to the back of said'she't'at'a typing station at the front of the platen, the combination with the rotary platen, means zfor'fe'eding the master sheet down under :the' platen 'from ith'e back and up the front thereof past the typing station, and ribbon-feeding, ,means for, feeding-,

"" -,rear of the platen for accommodating the sheet the ribbon between said sheet and platen atlth'e typing station, of a thin anvil of sheet material for taking the type impacts at the typing station, 5

and means for supporting said anvil at said stationa between the ribbon and the front of the platen which means comprises aistationaryanvib :support .arm extendingforwards from theme-a1 of the machine and-atits'front-end-leading downwards ,over the platen thereito .belocated behind the sheet ascen'ding'from thetyping station-and :aff'ording room beneath itr atmthe reanof the platemrfor accommodating the sheet, to be-fed underthe platen, andmeans on-the front end of :said arm fory'the removableyattachment of? the :anvil.

2. *In -a machine according, to claim 1, thecomlbination -of' means for feeding theribbon lengthwise of theplatem 'a ribbon; guide on saidarm which guide comprises :means for engaging top :and bottom marginsof the ribbon at both sides of the typing station,- and'm'eansfonmounting ;the anvil between said ribbon engaging means. 1

3. In a typewriting machine of the kind wherein type impressions are produced in reverse on the back of a master sheet by feeding a ribbon at a typing station behind said sheet and between it and a rotary platen which traverse endwise, the combination with type for producing the impressions, ribbon feeding means for feeding the rib- :bon along the front of the platen lengthwise of the direction of traverse, means for feeding the s heet upwards past the front of the platen and from the typing station, a stationary support member extending forwards from the rear of rthe machine and at its front end leading down 1 over the platen towards the typing station there to be locatedbehind the sheet ascending from the platen and affording room beneath it at the to be fed under the platen, and a ribbon guide on the support member for engaging the ribbon behind the sheet and in the region of the typing station and for positioning the ribbon against upward displacement; of a thin anvil, for taking the type impacts at the typing station, carried by the support member and positioned thereby at the typing station between the ribbon and the face of the platen.

CLAUDE WELLINGTON BRUMH'HJL.

' 'REFERENCES CITED Thefollowing references are of record in the fileof this patent:

UNITED STATES PATENTS 

